Microeconomics Exam 1 Review: Foundations, Models, and Trade-offs

Economics: Foundations and Models

Definition of Economics

Economics is the study of the choices people make to attain their goals, given their scarce resources. Scarcity means that resources are limited and cannot satisfy all human wants, necessitating choices and trade-offs.

• Scarcity: The fundamental economic problem of having limited resources to meet unlimited wants.

• Example: Choosing to attend a review session instead of another activity.

Resources of Production

Production of goods and services requires four key resources, also known as factors of production:

• Labor: The number and quality of workers available.

• Land: All natural resources, including dirt, water, oil, and air.

• Capital: Tools, factories, and equipment used to produce other goods.

• Entrepreneurship: The abilities of individuals willing to take risks and develop new products.

Microeconomics vs. Macroeconomics

Scope of Microeconomics

Microeconomics focuses on specific markets and individual choices, such as how taxes affect supply and demand for a particular product.

• Microeconomics: Studies how households and firms make choices, interact in markets, and how government influences these choices.

• Macroeconomics: Examines the economy as a whole, including inflation, unemployment, and broader economic trends.

Economic Models

Purpose and Assumptions

Economists use models to analyze human behavior, economic events, and government policies. Models are simplified versions of reality that focus on positive outcomes (what is happening).

• Models help analyze real-world issues and explain human behavior.

• Assumption: People are rational, meaning they make the best decisions possible with the information available, not necessarily the right or smart decision.

The Circular Flow Model

Overview

The circular flow diagram is a simplified economic model showing how money, goods, and services move through the economy. It typically includes households, firms, and markets, but may omit government, financial systems, and foreign buyers/sellers.

Productive and Allocative Efficiency

Productive Efficiency

Productive efficiency occurs when firms use the most cost-effective production techniques and achieve the lowest possible cost per unit of output. This is driven by competition.

• Key Point: Achieved when production is at the lowest cost.

Allocative Efficiency

Allocative efficiency is achieved when firms set the price of their product to match the marginal cost of production, ensuring resources are allocated where they are most valued by consumers. This arises from voluntary exchange.

• Key Point: Achieved when resources are allocated according to consumer preferences.

Marginal Benefit and Marginal Cost

Decision Making at the Margin

Optimal decisions are made by comparing the marginal benefit (additional revenue) and marginal cost (additional cost) of an action. Activity should continue up to the point where marginal benefit equals marginal cost.

• Formula: $MB = MC$

• Example: Apple considers the cost and revenue of producing 300,000 more iPhones.

Positive vs. Normative Statements

Definitions

• Positive Statement: Describes what is, can be tested or validated (e.g., "The U.S. minimum wage increased in 2009.").

• Normative Statement: Describes what ought to be, based on value judgments (e.g., "The government should raise the minimum wage to $10.").

Production Possibilities Frontier (PPF) and Opportunity Cost

PPF Definition and Properties

The Production Possibilities Frontier (PPF) is a curve showing the maximum attainable combinations of two goods that can be produced with available resources and technology.

• Points on the PPF: Attainable and efficient.

• Points below the PPF: Attainable but inefficient.

• Points above the PPF: Unattainable with current resources.

Example Table: Ford's Production Choices

Choice	Gasoline-Powered F-150s Produced per Day	Lightning EVs Produced per Day
A	60	0
B	40	20
C	20	40
D	0	60

Opportunity Cost

Opportunity cost is the highest-valued alternative that must be given up to engage in an activity. It is central to economic decision-making due to scarcity.

• Example: To produce 20 more EVs, Ford must produce 20 fewer gasoline-powered F-150s. The opportunity cost of 20 more EVs is 20 gasoline-powered F-150s.

Law of Increasing Opportunity Cost

The PPF is typically bowed outward because opportunity cost increases as more resources are allocated to one good. This is known as the law of increasing opportunity cost.

Economic Growth and PPF Shifts

• Economic growth shifts the PPF outward, allowing more production of both goods.

• Growth is caused by increases in resources or improvements in technology.

Absolute and Comparative Advantage

Absolute Advantage

An individual or country has an absolute advantage if it can produce more of a good than another using the same resources.

	Papers	Lectures
Shaun	8	10
Bryan	4	2

• Example: Shaun has the absolute advantage in writing papers (8 vs. 4).

Comparative Advantage

Comparative advantage exists when an individual or country can produce a good at a lower opportunity cost than another.

• Example: If Shaun's opportunity cost of producing lectures is lower than Bryan's, Shaun has the comparative advantage in lectures.

Basis for Trade

Trade is based on comparative advantage. Specialization and exchange allow all parties to consume more than they could produce alone.

• Benefit: Increases overall consumption and efficiency in society.

Summary Table: Key Terms

Term	Definition
Scarcity	Limited resources vs. unlimited wants
Opportunity Cost	Value of the next best alternative forgone
Productive Efficiency	Lowest cost per unit of output
Allocative Efficiency	Resources allocated to most valued uses
PPF	Maximum combinations of two goods
Absolute Advantage	Ability to produce more with same resources
Comparative Advantage	Ability to produce at lower opportunity cost

Additional info: These notes expand on the original slides and review content, providing definitions, examples, and tables for clarity and completeness.